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AppServiceRegistry.java
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package act.app;
/*-
* #%L
* ACT Framework
* %%
* Copyright (C) 2014 - 2017 ActFramework
* %%
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* #L%
*/
import act.Destroyable;
import act.event.EventBus;
import org.osgl.$;
import org.osgl.logging.LogManager;
import org.osgl.logging.Logger;
import org.osgl.util.C;
import org.osgl.util.E;
import javax.enterprise.context.ApplicationScoped;
import javax.inject.Inject;
import javax.inject.Singleton;
import java.util.Map;
@ApplicationScoped
class AppServiceRegistry {
private static Logger logger = LogManager.get(AppServiceRegistry.class);
private Map<Class<? extends AppService>, AppService> registry = C.newMap();
private C.List<AppService> appendix = C.newList();
private App app;
@Inject
AppServiceRegistry(App app) {
this.app = $.notNull(app);
}
synchronized void register(final AppService service) {
E.NPE(service);
final Class<? extends AppService> c = service.getClass();
if (!registry.containsKey(c)) {
registry.put(c, service);
tryRegisterSingletonService(c, service);
} else {
E.illegalStateIf(isSingletonService(c), "Singleton AppService[%s] cannot be re-registered", c);
// we know event bus will get registered twice for the `EventBus.onceBus`
if (!(service instanceof EventBus)) {
logger.warn("Service type[%s] already registered", service.getClass());
}
appendix.add(service);
}
}
<T extends AppService<T>> T lookup(Class<T> serviceClass) {
return (T) registry.get(serviceClass);
}
// Called when app's singleton registry has been initialized
synchronized void bulkRegisterSingleton() {
for (Map.Entry<Class<? extends AppService>, AppService> entry : registry.entrySet()) {
if (isSingletonService(entry.getKey())) {
app.registerSingleton(entry.getKey(), entry.getValue());
}
}
}
void destroy() {
Destroyable.Util.destroyAll(C.<Destroyable>list(appendix), ApplicationScoped.class);
Destroyable.Util.destroyAll(C.<Destroyable>list(registry.values()), ApplicationScoped.class);
appendix.clear();
registry.clear();
}
private boolean isSingletonService(final Class<? extends AppService> c) {
return c.getAnnotation(Singleton.class) != null;
}
private void tryRegisterSingletonService(final Class<? extends AppService> c, final AppService service) {
if (isSingletonService(c)) {
app.registerSingleton(c, service);
}
}
}